Double free in Linux kernel - CVE-2026-46189

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Main Vulnerability Database Vulnerabilities #VU133005

Double free in Linux kernel - CVE-2026-46189

Published: May 29, 2026


Vulnerability identifier: #VU133005
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-46189
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to double free in pvrdma_alloc_ucontext() error path when handling ucontext allocation failures. A local user can trigger the error path to cause a denial of service.


Affected software

Linux kernel
Anolis OS
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Ubuntu
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-debug
kernel-cross-headers
kernel-core
kernel
bpftool
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-devel
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf
kernel-abi-stablelists
kernel-doc
bpftool-debuginfo
kernel-debuginfo
python3-perf-debuginfo
perf-debuginfo
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-debugsource
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-46189

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - addressed in versions 4.18.0-305.199.1.el8_4, 4.18.0-372.201.1.el8_6, 4.18.0-477.152.1.el8_8, 4.18.0-553.139.1.el8_10, 5.14.0-284.179.1.el9_2, 5.14.0-427.136.1.el9_4, 5.14.0-570.127.1.el9_6, 6.12.0-211.29.1.el10_2
kernel-rt (Red Hat package) - addressed in versions 4.18.0-553.139.1.rt7.480.el8_10, 5.14.0-284.179.1.rt14.464.el9_2
kernel-debug - update to 4.18.0-553.139.1.0.1
kernel-cross-headers - update to 4.18.0-553.139.1.0.1
kernel-core - update to 4.18.0-553.139.1.0.1
kernel - update to 4.18.0-553.139.1.0.1
bpftool - update to 4.18.0-553.139.1.0.1
kernel-debug-core - update to 4.18.0-553.139.1.0.1
kernel-debug-devel - update to 4.18.0-553.139.1.0.1
kernel-debug-modules - update to 4.18.0-553.139.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.139.1.0.1
kernel-devel - update to 4.18.0-553.139.1.0.1
kernel-headers - update to 4.18.0-553.139.1.0.1
kernel-modules - update to 4.18.0-553.139.1.0.1
kernel-modules-extra - update to 4.18.0-553.139.1.0.1
kernel-tools - update to 4.18.0-553.139.1.0.1
kernel-tools-libs - update to 4.18.0-553.139.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.139.1.0.1
perf - update to 4.18.0-553.139.1.0.1
python3-perf - update to 4.18.0-553.139.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.139.1.0.1
kernel-doc - update to 4.18.0-553.139.1.0.1
bpftool - update to 5.10.0-320.0.0.222
bpftool-debuginfo - update to 5.10.0-320.0.0.222
kernel-debuginfo - update to 5.10.0-320.0.0.222
kernel - update to 5.10.0-320.0.0.222
python3-perf-debuginfo - update to 5.10.0-320.0.0.222
python3-perf - update to 5.10.0-320.0.0.222
perf-debuginfo - update to 5.10.0-320.0.0.222
perf - update to 5.10.0-320.0.0.222
kernel-tools-devel - update to 5.10.0-320.0.0.222
kernel-tools-debuginfo - update to 5.10.0-320.0.0.222
kernel-tools - update to 5.10.0-320.0.0.222
kernel-source - update to 5.10.0-320.0.0.222
kernel-headers - update to 5.10.0-320.0.0.222
kernel-devel - update to 5.10.0-320.0.0.222
kernel-debugsource - update to 5.10.0-320.0.0.222
linux (Ubuntu package) - addressed in versions 5.15.0.184.155, 5.15.0-184.194, 5.15.0-184.194~20.04.1, 5.15.0.186.166, 5.15.0-186.196, 5.15.0-186.196~20.04.1, 5.15.0.1075.78, 5.15.0-1075.79, 5.15.0.1095.94, 5.15.0-1095.103, 5.15.0.1104.100, 5.15.0-1104.109, 5.15.0.1108.107, 5.15.0-1108.114, 5.15.0.1111.115, 5.15.0-1111.120+fips1, 5.15.0.1112.102, 5.15.0.1112.109, 5.15.0-1112.122, 5.15.0-1112.122+fips1, 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2, 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-aws (Ubuntu package) - addressed in versions 5.15.0.186.109, 5.15.0-186.196+fips1, 5.15.0.1106.103, 5.15.0-1106.110, 5.15.0.1107.107, 5.15.0-1107.108, 5.15.0.1112.108, 5.15.0.1112.115, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0-1112.119~20.04.1, 6.8.0-1061.64+1, 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0.1053.55, 5.15.0.1064.64, 5.15.0-1064.66
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1104.106, 5.15.0.1104.108, 5.15.0-1107.113~20.04.1
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1106.110~20.04.1
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1107.106, 5.15.0-1107.113
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.105, 5.15.0-1109.115, 5.15.0.1117.115, 5.15.0-1117.126, 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1109.115~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1117.102, 5.15.0-1117.126+fips1, 6.8.0-1063.71+fips2
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1117.126, 6.8.0-1062.69
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1, 7.0.0-1008.8, 7.0.0-1010.10
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9

External References

Related Security Bulletins